At 03.38 hours on 5 April 1941 the unescorted Ena de Larrinaga (Master Reginald Sharpe Craston) was hit aft by one G7a torpedo from U-105 and sank slowly on an even keel 205 miles east of St. Paul Rocks. The U-boat had spotted the ship about 10 hours earlier and decided to wait for the night to attack. Five crew members of 39 crew members, two military and two naval gunners were lost. The master and 18 survivors were rescued after 13 days and landed at Rio de Fogo near Toures, Brazil. The chief officer and 18 survivors were picked up by the Brazilian steam passenger ship Almirante Alexandrio and landed at Pernambuco.

The master Reginald S. Craston was awarded an OBE and the Lloyd’s War Medal for bravery at sea.